Ezio Melotti added the comment:
The attached proof of concept catches Type/ValueError in str.encode and raises
another exception with a better message:
>>> 'example'.encode('hex_codec')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: invalid input type for hex_codec codec ('str' does not support the
buffer interface)
(note: the patch doesn't handle the exception chaining yet and probably leaks.)
If Nick proposal in msg187704 is accepted, this should become a
codecs.EncodeTypeError. The same should then be done for bytes.decode and for
codecs.encode/decode.
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Added file: http://bugs.python.org/file30190/issue17828-2.diff
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